So, knowledge is a union of certainty and uncertainty.

传统知识论一直是寻求确定性知识并为之辩护的事业。

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So in the essence the classroom teaching is unify of certainty and uncertainty.

所以，课堂教学从本质上说是确定性和不确定性的统一。

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And in a time of economic uncertainty, we need tax certainty.

在经济不确定的时候，我们的税收需要稳定。

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And in a time of economic uncertainty, we need tax certainty.

在经济不确定的时候，我们的税收需要稳定。

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